Mouse movement Command

In addition to the recent Idle & Timer commands, would it be possible to have a mouse movement (within the given skin) set off an ExecTBL command? The idea is to have a way to exit from a fullscreen visualization or screensaver type app.

I imagine that it would be fairly easy to add. EX: When the skin containing the "Movement" definition is loaded, somehow record the initial x,y of the mouse and then trigger the command if the x,y changes. (or something rather)